Composition for removing coatings.



UNITED STATES PATENT OFFICE.

JEROME NICHOLS HUM PHREYS, OF DALLAS, TEXAS, ASSIGNOR OF ONE-THIRD TO WALTER K. SMITH AND ONE-THIRD TO J. D. OLIGER, OF DALLAS, TEXAS.

COMPOSITION FOR REMOVING COATINGS.

No Drawing.

To all whom it may concern:

Be it known that I, JEROME N. HUM- PHREYS, a citizen of the United States, and a resident of Dallas, in the county of Dallas and State of Texas, have invented a new and Improved Composition for Removing Coatings, of which the following is a full, clear, and exact description.

My invention relates to a composition of matter for removing coatings,:such as paint, varnish, or similar finishes; and it comprises an ingredient adapted to form with the organic compounds of the coating a substance soluble in water. It also comprises a substance which will accelerate the action of the ingredient, and a vehicle for preventing the evaporation of the water and other valuable constituents in the composition.

The object of the invention is to providea simple and eflicient coating remover which will rapidly attack the coating and loosen the same from the surface to which itoriginally adhered, and it can then be removed from the surface by simply brushing or washing it off. V

My composition is prepared as follows: The main constituent is an alkali, preferably sodium hydrate of 30 degrees B. As an accelerator for the action of the alkali, an oxidizing agent, preferably potassium bichromate, is used. To prevent the evaporation of water from the compound a soap solution is used which contains, preferably, about of fatty acid. To create a colloidal state of the soap which prevents chemical separation of the above mixture, chlorid of lime is used with the addition of sodium chlorid. The colloidal state of soap in the mixture prevents chemical separation of the same and retains it in a pasty condition, which is due to the pecullar physical properties developed in its preparation.- To the compound is also added a, substance which is a good solvent for organic substances; preferably benzol is used.

The relative quantity of the material used when mixed together forms a compound in the colloidal state, the consistency of which is that of ordinary flour paste. The function of the ingredients stated is as follows: The sodium hydrate enters into combination with any organic substance and will form with same a soluble compound which may be removed by the application of water. It also assists in the neutralization of an acid in Specification of Letters Patent.

Application filed July 2,1913.

alkali;

Patented June 30, 1914.

Serial No. 777,012.

combination with metals forming the coating, thereby breaking it up.. The potassium blchromate being an oxidizing agent accelerates the work of the alkali.

The soap solution retards and restrains the evaporation of water in the composition, and also of the organic solvent employed, in this case benzol. The function of benzol is to dissolve compounds insoluble in water, also those which resist the action of the The chlorid of lime and solution chlorid are for the purpose of preventing the soap solution from separating out in the mixture in the presence of .an excess. of alkali.

Different proportions of the ingredients stated can be used to form the composition, but from experience I find that the best results are obtained when 40% of sodium hydrate is used, 20% of soap solution, 30% of chlorid of lime, 2% of sodium chlorid, 2% of potassium bichromate and 6% of benzol. When used this composition is spread on the coated surface by means of an ordinary brush. The layer of composition so formed on the coated surface is left for a sutlicient time to cut out the paint, varnish or any other similar finish. The action of the composition is ascertained by gently rubbing a damp cloth over it; if it seems loose all that is necessary is to either apply a stream of water from a hose or to wipe it off with a wet cloth or brush. Either method results in a perfectly clean surface free from paint, varnish or any similar finish. Plenty of water must be used to dissolve off any unused compound, which will immediately leave the surface under the soluble action of water.

It is easily seen that with my mixture the process of removing a coat from a surface is economical, does not require experienced operators, and no damage can be done to the cleansed surface.

It is understood that a mixture slightly varying in percentage of the ingredients as stated can be formed which will give substantially the same result, and, therefore, I am not. to be restricted to the percentage stated. Furthermore, the nature of some coatings will call for a mixture not requiring the presence of an organic compound, therefore simplifying the composition of th mixture.

Having thus described my invention, I

claim as new and desire to secure by Letters Patent:

1. A coating remover consisting of an alkali; an oxidizer for accelerating the action of the alkali; a solvent for organic compounds insoluble in water; and a vehicle for retarding the evaporation of the water and the solvent from the mixture and maintaining the same pasty, said vehicle consisting of a soap solution, chlorid of lime and sodium chlorid.

2. A coating remover consisting of sodium hydrate; an oxidizer for accelerating the action of the sodium hydrate; benzol; and a vehicle for retarding the evaporation of the water and the benzol from the mixture and maintaining the same in a colloidal state.

3. A coating remover consisting of sodium hydrate; potassium bichromate; benzol; and a vehicle retarding the evaporation of the benzol and the Water present in the mixture and maintaining said mixture in a colloidal state.

4. A coating remover consisting of l()% of sodium hydrate, 20% of soap solution, 30% of chlorid of lime, 2% of sodium chlorid, 2% of potassium bichromate, and

of benzol.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JEROME NICHOLS HUMPHREYS.

Witnesses:

WALTER K. SMITH, L. M. HIxoN. 

